Heavy Duty Screw Extractor for Damaged Screws: Deal with frozen, broken, stripped and damaged screws and bolts with this screw extractor set. These pullers will help you remove even the toughest broken fasteners with great efficiency. Durable Industrial Grade: Made of high tensile steel with high temperature forging, wear resistant, corrosion resistant , strong, durable and not easy to deform. Big Gripping Power: Aggressive multi-level teeth feature left-hand spiral design to provide extra gripping power and faster threading. Spiral grooves integrate to increase grip and reduce drag. Wide Application: The set of 10 pullers comes in a sturdy and handy box for easy storage and portability. Widely used in auto repair, garage, construction site, home renovation, etc. Correct Sizes: Always have the right extractor bit when it's time to deal with broken screws or jellies. This set has extractors ranging from 1/8" to 7/8" and each piece has a laser etched mark for easy identification. Product The studs and broken and damaged bolts are difficult to remove with traditional tools.